169 lines
4.4 KiB
C
169 lines
4.4 KiB
C
/* $NetBSD: fdt_dma.c,v 1.4 2019/02/27 16:56:00 jakllsch Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2015 Jared D. McNeill <jmcneill@invisible.ca>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: fdt_dma.c,v 1.4 2019/02/27 16:56:00 jakllsch Exp $");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/kmem.h>
|
|
#include <sys/queue.h>
|
|
|
|
#include <libfdt.h>
|
|
#include <dev/fdt/fdtvar.h>
|
|
|
|
struct fdtbus_dma_controller {
|
|
device_t dma_dev;
|
|
int dma_phandle;
|
|
const struct fdtbus_dma_controller_func *dma_funcs;
|
|
|
|
LIST_ENTRY(fdtbus_dma_controller) dma_next;
|
|
};
|
|
|
|
static LIST_HEAD(, fdtbus_dma_controller) fdtbus_dma_controllers =
|
|
LIST_HEAD_INITIALIZER(fdtbus_dma_controllers);
|
|
|
|
int
|
|
fdtbus_register_dma_controller(device_t dev, int phandle,
|
|
const struct fdtbus_dma_controller_func *funcs)
|
|
{
|
|
struct fdtbus_dma_controller *dma;
|
|
|
|
dma = kmem_alloc(sizeof(*dma), KM_SLEEP);
|
|
dma->dma_dev = dev;
|
|
dma->dma_phandle = phandle;
|
|
dma->dma_funcs = funcs;
|
|
|
|
LIST_INSERT_HEAD(&fdtbus_dma_controllers, dma, dma_next);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct fdtbus_dma_controller *
|
|
fdtbus_get_dma_controller(int phandle)
|
|
{
|
|
struct fdtbus_dma_controller *dma;
|
|
|
|
LIST_FOREACH(dma, &fdtbus_dma_controllers, dma_next) {
|
|
if (dma->dma_phandle == phandle)
|
|
return dma;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
struct fdtbus_dma *
|
|
fdtbus_dma_get_index(int phandle, u_int index, void (*cb)(void *), void *cbarg)
|
|
{
|
|
struct fdtbus_dma_controller *dc;
|
|
struct fdtbus_dma *dma = NULL;
|
|
void *dma_priv = NULL;
|
|
uint32_t *dmas = NULL;
|
|
uint32_t *p;
|
|
u_int n, dma_cells;
|
|
int len, resid;
|
|
|
|
len = OF_getproplen(phandle, "dmas");
|
|
if (len <= 0)
|
|
return NULL;
|
|
|
|
dmas = kmem_alloc(len, KM_SLEEP);
|
|
if (OF_getprop(phandle, "dmas", dmas, len) != len) {
|
|
kmem_free(dmas, len);
|
|
return NULL;
|
|
}
|
|
|
|
p = dmas;
|
|
for (n = 0, resid = len; resid > 0; n++) {
|
|
const int dc_phandle =
|
|
fdtbus_get_phandle_from_native(be32toh(p[0]));
|
|
if (of_getprop_uint32(dc_phandle, "#dma-cells", &dma_cells))
|
|
break;
|
|
if (n == index) {
|
|
dc = fdtbus_get_dma_controller(dc_phandle);
|
|
if (dc == NULL)
|
|
goto done;
|
|
dma_priv = dc->dma_funcs->acquire(dc->dma_dev,
|
|
dma_cells > 0 ? &p[1] : NULL, dma_cells * 4,
|
|
cb, cbarg);
|
|
if (dma_priv) {
|
|
dma = kmem_alloc(sizeof(*dma), KM_SLEEP);
|
|
dma->dma_dc = dc;
|
|
dma->dma_priv = dma_priv;
|
|
}
|
|
break;
|
|
}
|
|
resid -= (dma_cells + 1) * 4;
|
|
p += dma_cells + 1;
|
|
}
|
|
|
|
done:
|
|
if (dmas)
|
|
kmem_free(dmas, len);
|
|
|
|
return dma;
|
|
}
|
|
|
|
struct fdtbus_dma *
|
|
fdtbus_dma_get(int phandle, const char *name, void (*cb)(void *), void *cbarg)
|
|
{
|
|
u_int index;
|
|
int err;
|
|
|
|
err = fdtbus_get_index(phandle, "dma-names", name, &index);
|
|
if (err != 0)
|
|
return NULL;
|
|
|
|
return fdtbus_dma_get_index(phandle, index, cb, cbarg);
|
|
}
|
|
|
|
void
|
|
fdtbus_dma_put(struct fdtbus_dma *dma)
|
|
{
|
|
struct fdtbus_dma_controller *dc = dma->dma_dc;
|
|
|
|
dc->dma_funcs->release(dc->dma_dev, dma->dma_priv);
|
|
kmem_free(dma, sizeof(*dma));
|
|
}
|
|
|
|
int
|
|
fdtbus_dma_transfer(struct fdtbus_dma *dma, struct fdtbus_dma_req *req)
|
|
{
|
|
struct fdtbus_dma_controller *dc = dma->dma_dc;
|
|
|
|
return dc->dma_funcs->transfer(dc->dma_dev, dma->dma_priv, req);
|
|
}
|
|
|
|
void
|
|
fdtbus_dma_halt(struct fdtbus_dma *dma)
|
|
{
|
|
struct fdtbus_dma_controller *dc = dma->dma_dc;
|
|
|
|
return dc->dma_funcs->halt(dc->dma_dev, dma->dma_priv);
|
|
}
|